Continentalmantle metasomatism: a precursory event of platform activation?
大陆地幔交代作用：地台活化的先驱事件？
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They are formed from alkali basaltic magma that slightly melted out of continentalmantle by AFC mixing in depth, especially by the fractional crystallization in shallow horizon.
它是大陆地幔低度部分熔融产生的碱性玄武岩浆，通过深部AFC混合，尤其是浅部结晶分异机制形成的。
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The oceanic plate is made of denser and heavier rock, so it begins to sink down under the continental plate and into the mantle.